package cn.dai.advice;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import cn.dai.pojo.ResultData;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

import javax.annotation.Resource;

/**
 * @author daijiyong
 */
@RestControllerAdvice
public class ResponseAdvice implements ResponseBodyAdvice<Object> {
    @Resource
    ObjectMapper objectMapper;

    @Override
    public boolean supports(MethodParameter methodParameter, Class<? extends HttpMessageConverter<?>> aClass) {
        return true;
    }

    @Override
    public Object beforeBodyWrite(Object o, MethodParameter methodParameter, MediaType mediaType, Class<? extends HttpMessageConverter<?>> aClass, ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse) {

        if (o instanceof String) {
            try {
                return objectMapper.writeValueAsString(ResultData.success(o));
            } catch (JsonProcessingException e) {
                e.printStackTrace();
            }
        }

        // 如果已经封装了返回实体，则不再进行封装
        if (o instanceof ResultData) {
            return o;
        }
        return ResultData.success(o);
    }
}
